... .material: 100% food grade silicone 2.certificates: FDA,LFGB,ROHS 2012 best sell silicone usb braceletDetails Material:100%siliconeStyle:can supply different colors ... ,China (Mainland)Testing machine1.Digital Height Gauge, caliper, Coordinate measuring machine, projection machine,2. roughness tester, hardness tester and so on. QC ...